Car-brake



(No Model.)

E. A.'MARDEN.

CAR BRAKE.

10.577.515 Patented Peb. 2, 1897.1

"lill/lll Nirn 'raras ELLA ALBERTA MARDEN, OF WATEBTOVN, MASSACHUSETTS.

CAR-BRAKE.

SPECIFICATION forming part of Letters Patent NO. 577,515, dated February23, 1897.

Application filed July 13, 1896.

o all whom it may concern,.- A

Be it known that I, ELLA ALBERTA MARDEN, a citizen of the United States,residing at Watertown, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements in Car-Brakes, of which the following is a full, clear, and exact description,reference being had to the accompanying drawings, making part`of thisspecification, in which-- Figure l is a perspective view of a brakebeamand .brake-heads constructed in accordance with my invention. Fig. 2 isan Aenlarged vertical section of the same on the line 2 2 of Fig. l.Fig. 3 is an enlarged section of the same, taken through one of thebrake-heads, on the line 3 3 of Fig. l. Figs. 4 and 5 are verticalsections of brake-beams, illustrating modifications of my invention.

My invention has for its object to improve the construction of tubularbrale-beams for railway-cars, whereby they are rendered more durable andeifective and better adapted to resist the strain to which they aresubjected.

To this end my invention consists in `cer tain novel features anddetails of construction, as hereinafter fully set forth, andspecifically pointed out in the claims.

In the said drawings, A represents a tubular metallic brake-beam,preferably made of steel, and preferably of elliptical or oblong form incross-section, in which case it is arranged, as shown in the drawings,with its narrower sides or edges facingin the line or di# rection of thestrain, whereby the maximum degree of resistance is afforded to thebending force exerted in applying the brake.

B B represent the brake-heads, which are secured to the opposite ends ofthe tubular beam A, said heads being provided with stiffening-ribs, andeach having a horizon-A tally-elongated aperture h extending entirelythrough it for the reception of the end of the beam A, to which saidheads are secured by rivets or in any other preferred manner. Thebrake-heads and their connecting7beam are adapted to be suspended fromthe car-truck, and are provided with shoes d in the usual manner. To thecenter of the beam A is secured the lever-clamp or connecting-bar D,

Serial No. 599,0 16. (No model.)

which encircles the beam, and is provided at its inner end with aninclined slot f for the reception of the usual brake-lever by which thepower is applied to set the brake.

Vithin the tubular beam A, and extending therethrough from end to end,is placed a solid steel reinforcing-bar G, preferably flattened or ofgreater width than thickness, said bar being arranged with its narrowersides or edges in contact with the interior of the tube and presented inthe direction or line of the strain, as shown, thereby offering thegreatest resistance to the force applied to the beam to set the brake.

Before inserting the reinforcing-bar the tubular beam is preferablyslightly expanded by heating to admitabar of somewhat greater width thancould otherwise be employed, the contraction of the metal in coolingcausing the interior of the tube to lie closely against the narrowersides or edges of the bar at all points. After the reinforcing-bar hasbeen inserted within the tube its ends are heated to the welding-pointand compressed on all sides by hammering or swagin g to bring them intocontact and unite them with the bar to form solid homogeneous ends, asshown in Figs. l and 3, thereby increasing their strength, the reductionin sizeof the ends of the beam thus produced forming shoulders g g,against which rest the heads B B, as shown in Fig. 1. To still furtherstiften and strengthen the tubular beam A, I preferably provide thereinforcing-bar G on its upper and lower surfaces with longitudinalcentral ribs h h, which extend outward in contact with the upper andlower interior surfaces of the tubular beam, as shown in Fig. 2, butthese ribs may be dispensed with, if desired, and a plain flat baremployed, as shown in Fig. 4.

In some cases a tubular brake-beam of elliptical or iiattenedform incross-section, if of sufficient thickness, may be employed without areinforcing-bar, as shown in Fig. 5, its arrangement with its narrowersides or edges facing in the line or direction of the strain enabling itto resist great pressure and produce good results. I prefer, however, touse a flat reinforcing-bar in connection with the IOO tubular beam, aspreviously described, as I find such construction to be the mostpractical and productive of the best results.

That I claim as my invention, and desire to secure by Letters Patent,is-

l. In a car-brake, a tubular brake-beam having the brake-heads securedto its opposite ends, said tubular beam being reinforced by a solid barplaced Within the same in contact with its interior surface andextending from one end to the other of said beam, substantially asdescribed.

2. In a car-brake, a tubular brake-beam having the brake-heads securedto its opposite ends, combined with a solid Hat reinforcing-bar placedWithin the same with its narrower sides or edges facing in the line ordirection of the strain, substantially as described.

3. In a car-brake, a tubular brake-beam having the brake-heads securedto its opposite ends, combined with a solid flat reinforcingbar placedwithin the same with its narrower sides or edges facing in the line ordirection of the strain, and said 'lat reinforcing-bar being provided onits upper and lower surfaces With longitudinal ribs extending verticallytherefrom into contact with the upper and lowerinterior surfaces of thetube Within which said bar is placed, substantially as described.

4C. Acar-brake consisting of atubularbrakebeam of elliptical or oblongform in crosssection, and tivo brake-heads Within which the ends of saidbeam are secured, said tubular beam being arranged with its narrower Isides or edges facing in the line or direction of the strain,substantially as described.

5. In a car-brake, a tubular brake-beam of elliptical or oblong form incross-section and having the brake-l1eads secured to its opposite ends,in combination with a llattened reinforcing-bar placed within the same,said beam and reinforcing-bar being arranged with their narrower sidesor edges facing in the line or direction of the strain, substantially asdescribed.

6. In a carbrake, a tubular brake-beam having the brake-heads secured toits opposite ends, said beam being reinforced by a solid bar placedwithin the same, and said tubular beam being compressed at its ends tofit tightly around the reinforcing-bar on all sides of the same, therebyforming solid ends for insertion Within apertures in the brake-heads,substantially as described.

7. In a car-brake, the combination of a tubular brake-beam, twobrake-heads in which the ends of said beam are secu red, and a solidlla't reinforcing-bar placed Within said tubular beam with its narrowersides or edges facing in the line or direction of the strain, and alever-clamp or connecting-bar centrally secured to the tubular beam toreceive the brake-lever, substantially as described.

fitness my hand this 11th day of July, A. D. 1896.

ELLA ALBERTA MARDEN.

In presence of- P. E. TESCHEMACHER, B. L. MARDEN.

